Spark-coil.



PATENTED FEB. 19, 1907.

J. F. GAVANAGH.

SPARK COIL.

. l xPPLIoATIoN FILED 31121328.1905.

WITNEESEE 7 INVENTDH UNITED sTATEs PATENT oEEroE.'

JOHN F'. CAVNGH, OF PROVIDENCE, RHODE ISLAND.

SPARK-COIL.

Specification of Letters Patent.

Patented Feb. 19, 19o?.

Application iiled September 28, 1905. Serial No. 280,531.

.a spark-coil of few parte and inexpensive construction, which will beWaterproof', in which the coil and oon'nectionswill be protected. frominjury, and the coil secured and sealed without the employment of thewooden heads commonly used for those purposes.

To these ends my invention consists ci the novel construction.combination, and arrangementof parts hereinafter' described and claimed.

In the accompanying drawings, Figure l is a side elevation ci mysparlecoil, partly in l section. Fig. 2 is en end view of .my coil withordinary binding-posts. Fig. 3 is an end view of my coil with thecoil-wire connections concealed within the coil-protecting case. Fig. 4is a side elevation ot the saine with parte broken away to show asection ot one oi the connections. Fig. 5 is a sectional View of thecoil connection.

The core A with its covering B and the coil wound thereon with the coreends )rejectloeyond the ends of the coil-win ing are in' allc theordinary construction.

D represents a block of wood somewhat longer than the core andpreferably of rectangular cross-section, provided with a centrallongitudinal bore not extended entirely through the block and ofsomewhat greater diameter than the coil (l and longer than the core A.The block D thus iorins a case or tubeI openat o1. e end and integrallyclosed at the other end.,

The core A with its surroundii'ig coil C is inserted in the bore of theblock D until one end ofthe core rests upon the bottoni or Hoor of thebore with the corresponding end ci the coil some distance above saidfloor and the other end of the core projecting likewise heyond theadjacent end of the coil and ending at a point within said bore sonnedistance from the open end of said bore. The core and coil are solocated in the bore as to forni an annular space. around the coil andthe projecting ends of the core with some unoccupied space between theend of the core and the open end of thehore. I iill this annular spaceand the unoccupied space between the core end and the open end oi thebore with an insulating-wax E, poured therein in a molten state andallowed to cool and harden, thereby `forming a waterproof envelop aroundthe coil and heads filling the 'here around the prejectng ends ot thecore at each end of the coil-winding and a seal for the o enend ofthebore. rli'hc heads serve to ho dv the core and coil securely in placeand the envelop gives the required rigidity to the coil-wires, while thewhole is sealed within the hre and protected by the case D againstinjury.

P 'P represent ordinary hindingosts extending through one side of thebloc D, near one cn'd thereof, into the coil-containing here,wherein-the terminal ends of thecoil-wire are secured to them by solders.l

F F represent tubular connections set l'lush in one side of the block Dnear one end thereof and extending therethroiigh into thecoil-containing hore and secured 1n place by thesetscrewsjj", tappedinto said connections joer-v pendicularly to their bore G with theirheads set Hush wrththe end ot' the block D. The terminal ends of thecoil-wire are inserted in 'thc bore G and therein secured by soldernoted that in this fornL of construction the v connections are concealedwithin the block D, and thereby protected Jfrom injury.

I claim as in v invention and desire to secure by Letters Patcnt- Aspark-coil consisting of a core and ar coil oilwire wound thereon, saidcore ends projecting beyond the ends oi thev coil-windlng, incombinationV with a case provided with a bore longer than said core andof greater diinnctcr than said coil, and having one intcgrnlly-closcdend and one open end, and adapted to'l'oriu hoth an annular space aroundsaid core and coil inserted therein, and a space hctwccn ontl cud ofsaid core and the open cnd of said here, wire connectionsextcnding'outward from said bore through one side or' said oase near oneend thereof, the terminal ends of thc coil secured to said connectionswithin said bore, and a body of in- YOU sulatng-wox filling the portionof said boi-,e unoccupiod by tigo coro and coil to thoiel y Consfitutoan unllzu waterproof envelop for said coil, waterproof insulating-headssurrounding Lho core ends and. adapted to hold the coro-minding inplace, :md i1` waterproof insulating-svn] 'for Smd Caso.

two witnesses.

JOHN F. CAVA'NAGIU Witnesses ELMER WALKER, ISAAC N. LINCOLN.

ivetimony whereof I have signed my name to this specl'hcatlon 1n thepioscmcc pf

